Hydrogels including biopolymers

Abstract

The present application relates to a cosmetic hydrogel which contains a) at least two polymers selected from the group dehydroxanthan gum, xanthan gum and carrageenan, and b) water, as well as to the use of xanthan gum and/or carrageean for stabilizing the viscosity of a hydrogel which comprises dehydroxanthan gum.

1 .- 17 . (canceled) 
     
     
         18 . A cosmetic hydrogel, wherein the hydrogel comprises
 a. at least two polymers selected from dehydroxanthan gum, xanthan gum and carrageenan, and   b. water.   
     
     
         19 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises
 a. dehydroxanthan gum,   b. xanthan gum and/or carrageenan and   c. water.   
     
     
         20 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel further comprises from 5% to 25% by weight of ethanol, based on a total weight of the hydrogel. 
     
     
         21 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel further comprises from 10% to 16% by weight of ethanol, based on a total weight of the hydrogel. 
     
     
         22 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises from 0.1% to 5% by weight of dehydroxanthan gum, based on a total weight of the hydrogel. 
     
     
         23 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises from 0.6% to 2% by weight of dehydroxanthan gum, based on a total weight of the hydrogel. 
     
     
         24 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises a total of from 0.1% to 3% by weight of xanthan gum and/or carrageenan, based on a total weight of the hydrogel. 
     
     
         25 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises a total of from 0.2% to 0.7% by weight of xanthan gum and/or carrageenan, based on a total weight of the hydrogel. 
     
     
         26 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises from 0.1% to 3% by weight of xanthan gum, based on a total weight of the hydrogel. 
     
     
         27 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises from 0.1% to 3% by weight of carrageenan, based on a total weight of the hydrogel. 
     
     
         28 . The cosmetic hydrogel of  claim 18 , wherein a weight ratio of dehydroxanthan gum to a total of xanthan gum and/or carrageenan is from 10:1 to 1:1. 
     
     
         29 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises at least 70% by weight of water, based on a total weight of the hydrogel. 
     
     
         30 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel comprises not more than 99% by weight of water, based on a total weight of the hydrogel. 
     
     
         31 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel is free from polymers obtained from a homo- or copolymerization of vinyl pyrrolidone, acrylic acid and/or methacrylic acid. 
     
     
         32 . The cosmetic hydrogel of  claim 18 , wherein the hydrogel further comprises one or more short-chain polyols having from 2 to 8 carbon atoms. 
     
     
         33 . The cosmetic hydrogel of  claim 32 , wherein the one or more short-chain polyols having from 2 to 8 carbon atoms are present in a concentration of from 1% to 30% by weight, based on a total weight of the hydrogel. 
     
     
         34 . The cosmetic hydrogel of  claim 32 , wherein the one or more short-chain polyols having from 2 to 8 carbon atoms are selected from glycerin, methylpropanediol, propylene glycol, hexane-1,2-diol, caprylyl glycol, butylene glycol and pentylene glycol. 
     
     
         35 . The cosmetic hydrogel of  claim 32 , wherein the one or more short-chain polyols having from 2 to 8 carbon atoms comprise at least hexane-1,2-diol. 
     
     
         36 . The cosmetic hydrogel of  claim 35 , wherein hexane-1,2-diol is present in a concentration of from 0.2% to 2% by weight, based on a total weight of the hydrogel. 
     
     
         37 . A method of stabilizing the viscosity of a hydrogel which comprises dehydroxanthan gum and water, wherein the method comprises incorporating in the hydrogel xanthan gum and/or carrageenan in a concentration which stabilizes the viscosity of the hydrogel.